I was just wondering what the numbers are for amendments made in the en route environment. So for example, I know that 6 = Fix, 7 = Time, and 10 = Route. What I want to know is what are 1-5, 8 & 9? Thanks in advance.
the difference between the two is 9 is used for aircraft that haven't departed yet. if field 7 is a P time then use 9 for altitude. field 8 is for aircraft already airborne. if field 7 is a D or E time then use field 8.
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